If DNA is a code who wrote it?

Answer 1

DNA is called 'code' metaphorically. In reality, the 'Genetic Code' is a correspondence of base sequence in DNA (and RNA) to specific amino acids, which may have more to do with the chemical affinity of RNA and amino acids than an intelligently-designed program. One must always be on one's guard not to confuse metaphors with reality. As the geneticist Richard Lewontin wrote in his book The Triple Helix: It is not possible to do the work of science without using a language that is filled with metaphors. Virtually the entire body of modern science is an attempt to explain phenomena that cannot be experienced directly by human beings, by reference to forces and processes that we cannot perceive directly becauiause they are too small, like molecules, or too vast, like the entire known universe, or the result of forces that our senses cannot detect, like electromagnetism, or the outcome of extremely complex interactions, like the coming into being of an individual organism from its conception as a fertilized egg. Such explanations, if they are to be not merely formal propositions, framed in an invented technical language, but are to appeal to the understanding of the world that we have gained through ordinary experience, must necessarily involve the use of metaphorical language. Physicists speak of 'waves' and 'particles' even though there is no medium in which those 'waves' move and no solidity to those 'particles'. Biologists speak of genes as 'blueprints' and DNA as ' information'. Indeed, the entire body of modern science rests on Descarte's metaphor of the world as a machine, which he introduced in Part V of the Discourse on Method as a way or understanding organisms but then generalized as a way of looking at the entire universe...While we cannot dispense with the metaphors in thinking about nature, there is a great risk of confusing the metaphor with the thing of real interest. We cease to see the world as if it were a machine and take it to be a machine. The result is that the properties we ascribe to our object of interest and the questions we ask about it reinforce the original metaphorical image and we miss the aspects of the system that do not fit the metaphorical approximation. As Alexander Rosenblueth and Norbert Weiner have written, 'The price of metaphor is eternal vigilance'.

Answer 2

DNA is a biological molecule that carries genetic instructions for the development, functioning, growth, and reproduction of living organisms. It was not "written" by a person but has evolved over millions of years through natural selection. The genetic code within DNA is a product of evolution and not the result of a deliberate writer.